5．已知f (sinx-1)＝cos2x+2.则f (x)的表达式是 (A)f (x)＝-x2-2x+2, x∈[0, 2] (B)f (x)＝-x2-2x+2, x∈[-2, 0] (C)——青夏教育精英家教网——

摘要：5．已知f (sinx-1)＝cos2x+2.则f (x)的表达式是 (A)f (x)＝-x2-2x+2, x∈[0, 2] (B)f (x)＝-x2-2x+2, x∈[-2, 0] (C)f (x)＝x2+x-2, x∈[-2, 0] (D)f (x)＝x2+x-2, x∈[0, 2]

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(理)已知f(sinx)=cos2x,则f(cos15°)的值是

A. B. C. D.

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A. B.

C.± D.或

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已知f(sinx)=cos2x，则f(x)等于…（）

A.2x²-1 B.1-2x² C.2x D.-2x

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已知f(sinx)=sin3x,则f(cosx)等于( )

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已知f(sinx)＝sin3x，则f(cosx)等于

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